EXPLANATION OF THE PLATE. 



Plate DCIII. Tsuga Canadensis. 



1. A branch with staminate flowers, natural size. 



2. A staminate flower, enlarged. 



3. An anther, side view, enlarged. 



4. An anther, front view, enlarged. 



5. A branch with pistillate flowers, natural size. 



6. A pistillate flower, enlarged, 



7. A scale of a pistillate flower, lower side, with its bract, enlarged. 



8. A scale of a pistillate flower, upper side, with its ovules, enlarged. 



9. A fruiting branch, natural size. 



10. A cone-scale, upper side, with its seeds, natural size. 



11. A seed, natural size. 



12. Vertical section of a seed, enlarged. 



13. An embryo, enlarged. 



14. Cross section of a leaf magnified fifteen diameters. 



15. A leaf divided transversely, enlarged. 



16. Winter branch-buds, enlarged. 



17. Seedling plants, natural size. 



